US PATENT SUBCLASS 521 / 187
.~.~.~ Nitrogen containing reactant

Current as of: June, 1999
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521 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
50  DF  .~ CELLULAR PRODUCTS OR PROCESSES OF PREPARING A CELLULAR PRODUCT, E.G., FOAMS, PORES, CHANNELS, ETC. {27}
186  DF  .~.~ Cellular product derived from reactant which is an aldehyde or aldehyde derivative {1}
187.~.~.~ Nitrogen containing reactant {1}
188  DF  .~.~.~.~> Nitrogen reactant contains a -N-C(=X)-N group wherein X is a chalcogen atom, e.g.,urea, etc.

DEFINITION

Classification: 521/187

Nitrogen containing reactant:

(under subclass 186) Subject matter wherein at least one reactant contains a nitrogen atom.

(1) Note. The nitrogen atom may be part of the aldehyde or derivative or may be part of an additional coreactant. Hexamethylenetetramine although an aldehyde derivative is excluded from this subclass as being a nitrogen containing reactant.